Sneak Peek! Glee: I Am Unicorn
Shelby Corcoran (guest star Idina Menzel) returns to the halls of McKinley High. Meanwhile, Mr. Schuester (Matthew Morrison) initiates a boot camp for some of the members of New Directions.
Lea Michele, Dianna Agron, Cory Monteith, Mark Salling, Harry Shum, Jr., Chris Colfer, Amber Riley, Kevin McHale, Jenna Ushkowitz, Darren Criss , Heather Morris, Naya Rivera , Jane Lynch, and Jayma Mays also star.
Glee airs every Wednesday on ETC via satellite at 4 p.m., with replays at 9 p.m.